find maximum and minimum

Hello, I have a matrix 1000*2 in Excel file. So I call these data and plot them. I am looking for all Maximum and minimum, however I don't know the equation due to having only points. I am using R2012a and couldn't use findpeak. any suggestions please?

Answer 1

[Image Analyst]

If you don't have findpeaks() because you don't have the Signal Processing Toolbox, you can use imregionalmin() and imregionalmax() if you have the Image Processing Toolbox.

[sama]

Thanks for response. How can I check if I have Image Processing Toolbox or Signal Processing Toolbax please.

[Image Analyst]

Well don't accept the answer if you haven't even tried it. type "ver" on the command line to see what toolboxes you have installed.